Precise reddening and metallicity of NGC6752 from FLAMES spectra

(abridged) Accurate reddenings for Globular Clusters could be obtained by comparing the colour-temperature obtained using temperatures from reddening-free indicator (Halpha), with that given by standard colour-temperature calibrations. From a single 1300 seconds exposure with FLAMES at VLT2 we obtained spectra centred on Halpha (R=6000, 5

Keywords:

• Globular cluster
• Red-giant branch
• Calibration
• Metallicity
• Astrophysics
• Spectral line
• Stars
• Physics

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